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compressed_pair.hpp
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compressed_pair.hpp
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//@HEADER
// ************************************************************************
//
// Kokkos v. 4.0
// Copyright (2022) National Technology & Engineering
// Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Part of Kokkos, under the Apache License v2.0 with LLVM Exceptions.
// See https://kokkos.org/LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//@HEADER
#pragma once
#include "macros.hpp"
#include "trait_backports.hpp"
#if !defined(_MDSPAN_USE_ATTRIBUTE_NO_UNIQUE_ADDRESS)
# include "no_unique_address.hpp"
#endif
namespace MDSPAN_IMPL_STANDARD_NAMESPACE {
namespace detail {
// For no unique address emulation, this is the case taken when neither are empty.
// For real `[[no_unique_address]]`, this case is always taken.
template <class _T1, class _T2, class _Enable = void> struct __compressed_pair {
_MDSPAN_NO_UNIQUE_ADDRESS _T1 __t1_val{};
_MDSPAN_NO_UNIQUE_ADDRESS _T2 __t2_val{};
MDSPAN_FORCE_INLINE_FUNCTION _MDSPAN_CONSTEXPR_14 _T1 &__first() noexcept { return __t1_val; }
MDSPAN_FORCE_INLINE_FUNCTION constexpr _T1 const &__first() const noexcept {
return __t1_val;
}
MDSPAN_FORCE_INLINE_FUNCTION _MDSPAN_CONSTEXPR_14 _T2 &__second() noexcept { return __t2_val; }
MDSPAN_FORCE_INLINE_FUNCTION constexpr _T2 const &__second() const noexcept {
return __t2_val;
}
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr __compressed_pair() = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr __compressed_pair(__compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr __compressed_pair(__compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
_MDSPAN_CONSTEXPR_14_DEFAULTED __compressed_pair &
operator=(__compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
_MDSPAN_CONSTEXPR_14_DEFAULTED __compressed_pair &
operator=(__compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
~__compressed_pair() = default;
template <class _T1Like, class _T2Like>
MDSPAN_INLINE_FUNCTION constexpr __compressed_pair(_T1Like &&__t1, _T2Like &&__t2)
: __t1_val((_T1Like &&) __t1), __t2_val((_T2Like &&) __t2) {}
};
#if !defined(_MDSPAN_USE_ATTRIBUTE_NO_UNIQUE_ADDRESS)
// First empty.
template <class _T1, class _T2>
struct __compressed_pair<
_T1, _T2,
std::enable_if_t<_MDSPAN_TRAIT(std::is_empty, _T1) && !_MDSPAN_TRAIT(std::is_empty, _T2)>>
: private _T1 {
_T2 __t2_val{};
MDSPAN_FORCE_INLINE_FUNCTION _MDSPAN_CONSTEXPR_14 _T1 &__first() noexcept {
return *static_cast<_T1 *>(this);
}
MDSPAN_FORCE_INLINE_FUNCTION constexpr _T1 const &__first() const noexcept {
return *static_cast<_T1 const *>(this);
}
MDSPAN_FORCE_INLINE_FUNCTION _MDSPAN_CONSTEXPR_14 _T2 &__second() noexcept { return __t2_val; }
MDSPAN_FORCE_INLINE_FUNCTION constexpr _T2 const &__second() const noexcept {
return __t2_val;
}
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr __compressed_pair() = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr __compressed_pair(__compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr __compressed_pair(__compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
_MDSPAN_CONSTEXPR_14_DEFAULTED __compressed_pair &
operator=(__compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
_MDSPAN_CONSTEXPR_14_DEFAULTED __compressed_pair &
operator=(__compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
~__compressed_pair() = default;
template <class _T1Like, class _T2Like>
MDSPAN_INLINE_FUNCTION constexpr __compressed_pair(_T1Like &&__t1, _T2Like &&__t2)
: _T1((_T1Like &&) __t1), __t2_val((_T2Like &&) __t2) {}
};
// Second empty.
template <class _T1, class _T2>
struct __compressed_pair<
_T1, _T2,
std::enable_if_t<!_MDSPAN_TRAIT(std::is_empty, _T1) && _MDSPAN_TRAIT(std::is_empty, _T2)>>
: private _T2 {
_T1 __t1_val{};
MDSPAN_FORCE_INLINE_FUNCTION _MDSPAN_CONSTEXPR_14 _T1 &__first() noexcept { return __t1_val; }
MDSPAN_FORCE_INLINE_FUNCTION constexpr _T1 const &__first() const noexcept {
return __t1_val;
}
MDSPAN_FORCE_INLINE_FUNCTION _MDSPAN_CONSTEXPR_14 _T2 &__second() noexcept {
return *static_cast<_T2 *>(this);
}
MDSPAN_FORCE_INLINE_FUNCTION constexpr _T2 const &__second() const noexcept {
return *static_cast<_T2 const *>(this);
}
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr __compressed_pair() = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr __compressed_pair(__compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr __compressed_pair(__compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
_MDSPAN_CONSTEXPR_14_DEFAULTED __compressed_pair &
operator=(__compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
_MDSPAN_CONSTEXPR_14_DEFAULTED __compressed_pair &
operator=(__compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
~__compressed_pair() = default;
template <class _T1Like, class _T2Like>
MDSPAN_INLINE_FUNCTION constexpr __compressed_pair(_T1Like &&__t1, _T2Like &&__t2)
: _T2((_T2Like &&) __t2), __t1_val((_T1Like &&) __t1) {}
};
// Both empty.
template <class _T1, class _T2>
struct __compressed_pair<
_T1, _T2,
std::enable_if_t<_MDSPAN_TRAIT(std::is_empty, _T1) && _MDSPAN_TRAIT(std::is_empty, _T2)>>
// We need to use the __no_unique_address_emulation wrapper here to avoid
// base class ambiguities.
#ifdef _MDSPAN_COMPILER_MSVC
// MSVC doesn't allow you to access public static member functions of a type
// when you *happen* to privately inherit from that type.
: protected __no_unique_address_emulation<_T1, 0>,
protected __no_unique_address_emulation<_T2, 1>
#else
: private __no_unique_address_emulation<_T1, 0>,
private __no_unique_address_emulation<_T2, 1>
#endif
{
using __first_base_t = __no_unique_address_emulation<_T1, 0>;
using __second_base_t = __no_unique_address_emulation<_T2, 1>;
MDSPAN_FORCE_INLINE_FUNCTION _MDSPAN_CONSTEXPR_14 _T1 &__first() noexcept {
return this->__first_base_t::__ref();
}
MDSPAN_FORCE_INLINE_FUNCTION constexpr _T1 const &__first() const noexcept {
return this->__first_base_t::__ref();
}
MDSPAN_FORCE_INLINE_FUNCTION _MDSPAN_CONSTEXPR_14 _T2 &__second() noexcept {
return this->__second_base_t::__ref();
}
MDSPAN_FORCE_INLINE_FUNCTION constexpr _T2 const &__second() const noexcept {
return this->__second_base_t::__ref();
}
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr __compressed_pair() = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr __compressed_pair(__compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr __compressed_pair(__compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
_MDSPAN_CONSTEXPR_14_DEFAULTED __compressed_pair &
operator=(__compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
_MDSPAN_CONSTEXPR_14_DEFAULTED __compressed_pair &
operator=(__compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
~__compressed_pair() = default;
template <class _T1Like, class _T2Like>
MDSPAN_INLINE_FUNCTION constexpr __compressed_pair(_T1Like &&__t1, _T2Like &&__t2) noexcept
: __first_base_t(_T1((_T1Like &&) __t1)),
__second_base_t(_T2((_T2Like &&) __t2))
{ }
};
#endif // !defined(_MDSPAN_USE_ATTRIBUTE_NO_UNIQUE_ADDRESS)
} // end namespace detail
} // end namespace MDSPAN_IMPL_STANDARD_NAMESPACE